The seller will take $850, which seems to be about the going rate for this machine as far as I can tell. It's supposed to be in "good" condition. What are problem areas that I should look out for? I have read that Comet is a relatively simple, low-maintenance pin. Is this true? That would be what I am looking for -- a nice game for the kids that I don't have to constantly fix, quite unlike my DW, which breaks about every 10 games!